Screen goes nuts when FCPX is running
Something unusual has started happening when I am using Final Cut Pro X. When I do something else which requires graphics (like Mission Control, for instance) the screen goes nuts and multicoloured, like a 60's rock concert poster. If I quit FCPX, it solves the problem, although for some reason the title menu bar appears distorted still, as if the colour values are messed up.
Any idea why this could be happening and only when FCPX is running? It happened using Mojave and still with Catalina, by the way. Could there be some issue with my graphics card in my iMac?